Devstack will automatically create an image for the micro OS Cirros which
can be referenced as: ami-00000003. This image is sufficient for testing the
provisioning component of OpenStack Provisioner, but it is not possible to install
Puppet on this image.

Finally, you'll probably want to configure the default security group to
allow SSH (Port 22) access. This can be accomplished through the Horizon
console. The install actions will fail if they cannot access the target system
on port 22 (SSH).